Swap error message when updating initramfs

Support & Help Requests
#1

After sudo update-initramfs -u
I get the message
update-initramfs: Generating /boot/initrd.img-5.4.0-70-generic
W: initramfs-tools configuration sets RESUME=defe9cb2-3755-4cdd-946e-e4718333837b
W: but no matching swap device is available.

I'm running freshly installed 20.04.2 LTS without swap partition but with /swapfile.
The UUID shown in the message above is attributed to sda1.

The original /etc/initramfs-tools/conf.d/resume contained the same UUID. I made a backup of this file, deleted the UUID and got the same message after updating initramfs. Then I changed the line to RESUME=/swapfile and still got the same message after updating initramfs.

What do I have to do to avoid that swap error?

#2

Hi jodother,
I think you are updating a Swap that have no partition. In 20.04 there's no need to create a swap partition, like you say there's a most practical swapfile in /root.
After delete swap partition if you have one, you must:
sudo blkid | grep root (and see UUID number)
Open etc/crypttab, and change UUID (root number)
Open etc/fstab, and type at the bottom:
/swapfile none swap sw 0 0
Go to /etc/initramfs-tools/conf.d and delete resume file
Update initramfs:
sudo update-initramfs -u -k all
Reboot.

Lucky!

#3

Thanks for taking your time but that didn't work.
sudo blkid | grep root
was ok, no output, no error message
etc/crypttab
doesn't exist on my notebook
etc/fstab
already contained the line /swapfile none swap sw 0 0
sudo update-initramfs -u -k all
generated the same error described before, before and after reboot

#4

Hi again,
Strange. Have you ckeck if swapfile file is present in / ? Maybe's been deleted for any reason. If not, copy it from live version and paste in there. It's only a possibility, nothing lost.
Advise that 20.04.02 and 20.04.01 have experimented some specific errors until present. Perhaps is better fresh install 20.04 and update later.

#5

Yes, swapfile is present in root directory.
I'm not sure if this error has any effect, such as a longer boot time. Or can I just ignore it?

#6

Almost for me, and sadly, my experience tell me never a warning message in ubuntu must be ignored. Perhaps anyone could add more light on this...you always can backup and reinstall by the hard way (overkill) if there's no alternative.